It means that somone has already ergistered with this key. If you have bought this game and found this key on your game case or on the back of the manual then you will need to contact EA games.
check that the program is compatible with win xp
win xp has been unsupported for more than 10 years so many programs will not run in that operating system
Games, like MOHAA I think play good in windows 8.1 and windows 10 , I already prove it that. just, make sure the version of your OS, 32 bit, or 64bit. and just copy de MOHAA folder if you have a backup of your past OS eje: windows 7, justo copy the Mohaa folder. it should work.
Have fun!
Carl
